“Because Robin Williams has brought a smile to my face so many times in this life! Let’s honor what he did, not how he left!” one person wrote in support of signing the petition.

Williams died Monday in his Tiburon home at age 63. His death shocked family, friends and fans across the Bay Area and the world, drawing an outpouring of grief and tributes.

Julie Wainwright, who started the petition, explained the reason behind it through a brief message on Change.org: "To remember and honor the very important citizen and world renowned entertainer, Robin Williams, for the joy he brought to the world and to bring awareness to the silent illness that eventually took his life."

Williams was sober and battling early stages of Parkinson's disease when he committed suicide early this week, his widow Susan Schneider said.

The Waldo Tunnel is a tunnel on U.S. 101 between the Golden Gate Bridge and Sausalito. William Waldo was a California politician who ran unsuccessfully for governor in 1853. The tunnel’s archways are painted in rainbow colors, which is why people sometimes call it the "rainbow tunnel."